<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <script src="js/jquery-1.11.3.js"></script>
</head>

<body>
  <ul>
    <li>click me</li>
  </ul>

  <script>
    $("ul li").click(function () {
      // $this.parent().append($this.clone(true));
      $(this).clone(true).appendTo("ul");
    });
  </script>
</body>


</html>